It's a highly technical read, and ultimately Morey doesn't believe an iPad Pro is ready for this task yet, but it's worth pointing out that many of the issues outlined by Morey are applicable to anyone who uses an iPad as their primary computer today. For instance, the problem with Files APIs, introduced in iOS 11 and still not widely adopted by third-party document-based apps:

I’ve already posted about the messy landscape of options for moving and accessing files in iOS. The only way apps should be doing it currently is with iOS 11 style file APIs, but many apps have either legacy file solutions, bespoke (ie, confusingly different — and differently-abled) file pickers or would rather pull you into their own cloud platform.
[...]
Apple need to evangelise the right way to do this before basic file management turns off the potential users before they get to the inspiring parts of iPad usage. But to really make it work, app developers need assistance to update older apps to the latest APIs. Many app devs spent huge amounts of time building custom solutions before any good options existed, only to see little in terms of revenue to encourage them to rewrite their app as new APIs came along. The iPad Pro marketplace needs to be turning a corner in terms of viability to bring these apps back into the modern iOS world.

Make sure to watch the videos in Morey's piece – I love how he detailed every single step of the workflows he tried to build on his iPad Pro.